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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcc440dbac4b2b93d7d66845f24ab0e89482df889086003446f36341d9c6e3c6' 
  AND token = 'yzQO9vcmwx4eZR/VXeePRdhxJutQP8ff8y7/RgiKw4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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