SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08ebaf56bb410995b3067fa12df9a40769c1d0f164abbc43ca635bc4f8491db5' 
  AND token = '4T/jhUz/Gty2aDTjeUe3hV/OX73LRoyjWuw7nk3laqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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