SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23fe01cef3597e826e29727e958b5dbd5e9847a20a8a969b75a7cc8bc6513518' 
  AND token = 'ZL0j+QCdW2y6k9ZP4v1/1GYBvlmQXpd4RSUMCAbdUvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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