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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73e5b332282d53c59e66e2eceffbb11f7a0ce326c559caef4da5b83226ec1de1' 
  AND token = 'PXdSeW93TRAwxaCy7dU+s0CNE5yD7v1yq5dzgmu2RL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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