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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a4305229af456096ebc0b31eacb58630ae7ab71dac01c6f987e6a7bb56952ee' 
  AND token = 'qhp/7xVgJFOtCITtts/xBJNsvYDbSFJlI8rFgTveDsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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