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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58144ddce3298f94bfc97b3cadc5a645759fc3c7e0fc752b9dd4fbabba2d204c' 
  AND token = 'iSgHwn6DjY2RABpqbbydCdsXAgUQqa4UnSZXtsOkndI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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