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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abb47a5db7bb6836bd8b630eadc7977ca33f37c03049e73466086fcb01e18c54' 
  AND token = 'zg9huNUJWGMe8QFhTAHBKskFa4ijPRouixCsvFtpJhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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