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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d7868aa0f8a3c2b2267e065f1d0ba6c892c28345bd707d761cf63a0dad8b379' 
  AND token = 'GZYmP3OmRq8EoEZOr5exwBJieerY2m/U08tq6XAMjnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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