SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e73ea39cd1fbaa3c9ca55a7b0e65401e9f40c0bea151c7896130983a674ba6f6' 
  AND token = 'W2snJmBVrC3yivgs0FSfRXC5L4WRBsGI1hDKYOrjgFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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