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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1627634537c46ec382232ea82ee7ef591fde6c06a02a18de48424af53122093' 
  AND token = 'x4ZCwEK49XnK6baKkPH0XB5HRlV2LY1vvA32VQ7J5JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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