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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b99424d944830b2f58769c77011b010e0f36efdaa8e5bdd5ba5a86ce57ef38bf' 
  AND token = 'bACPAI3jDmaWLzE+V/4TmS7yryck4aNu5xMTjIOFl9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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