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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5688895a55ea671049111569e2b37a340ced738583b5e9029927faee29477831' 
  AND token = 'OadSEF59WCn94tuxNL8emBPFpENvv24kzJdnkDVYS+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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