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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19c271a945b323b3e5b0765df68fbe9c31da48a587e10dbdbc09bb90a4bb83e5' 
  AND token = 'nLzDYS4Bk98CE1n4SInOd6XWg/90CbX2oWmtrdpaV9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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