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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4eb733c2e07095a4e6fdfe9c05716d4d90b443fb505e693905a3dddda4ecb03b' 
  AND token = 'aKBCn1KBEK/HvWu+EFI3OdsO0aRlZPJAh0SLmNxQxdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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