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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdadb24cf0ca8a6024f8f4bc95c94dbd2a48615ad7ea4d6001457d03911ed9cf' 
  AND token = 'JbOGJy4kcLOYEnBj8Vrgk7EPMcfMLV83+U69Z2CSrsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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