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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9850fa12f8d6fb9815d9dd184ebf0cc02fecf0264bc432ef46fc91d66219575' 
  AND token = 'mwwfIwGeEHXheC6TLNFk0Rx2oj0anYqBwj0CwK5iDnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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