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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a71d171f35d8570c93d958e7ff9fbf5f400361825234a3accfaf8ac5c194037c' 
  AND token = 'bi66LEIoO+lV20+ncEMrpY1LE3pSFpfCcZc7Y/aPxi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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