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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0a3f36285aefe52b37de2b1fd9f9f086fc5009efec8d1a9ce305628339fea89' 
  AND token = 'u6NmHX0qqnjKbSODBEl1xyWewxwswNlBIgd9HulNh7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}