SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '894f4e8f8b02f582725b68e397f52acbcc0471276d30a16d00d2ca13137c0820' 
  AND token = 'Yq/Q5IfUQ9Fb9QzGqOS22YKOVvfshE/IO8IZtqh6E48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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