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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff731289c1c9c440d8f510e3962e29dea5e54976d1099c50ef7aaee946c5bbbe' 
  AND token = 'sneu9kL4Od3l13jYHExoW/iDfZBr9+aKPd2iZRnVIFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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