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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa5239888ffac2c39944c7d22a0ada7a25af12a4a67c4120815e70a1f5772852' 
  AND token = 'jsMrfpkg0/9cFQDclB3Q73PskSECxtymgU9h992rJGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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