SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3d079486ff2846f4eb4b2fd17bd7982650c19a855c9e69157302a26529dfb4a' 
  AND token = 'El4BM3Zp09qLQAUH3g6QpmgG6N7EjV8zBeLJvXhbWPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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