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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9717344b705443f53508d4adb23dbb7a4f9a83278ca41b9b5a6aa750408a9931' 
  AND token = 'ex7KQ6WmkXg37n7FCSQV5RgU5mbcCDtB7TMoxVehVKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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