SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54387e2e739ac0265cf928bbdc017f472d8fda48c844a6d1f666d7e08e35ef2c' 
  AND token = 'ZVje+J4LJvywomsG63ucQn1BnaCFqktoS1Jf2EBYPhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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