SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f431c1247100116363acabf7b368d9bb076eda96399f0ec8e440a1a77c49258' 
  AND token = 'BZ0MMDOi3JrYxzYF+GqJhFYZI0YfXyU7zg9eu0Tar9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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