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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '873ae4a5960ac5064fb8aa711a42227de23cdd72f208cacb622d0d9536593bbf' 
  AND token = '5Qed6atBk407O7B6o8wPXl4S6B3hnN3ZeCW7SVXCxt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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