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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '447141db791d191ab7729cc37e607578f90ffef414a5a7ae5dc4bf74e57a178d' 
  AND token = 'Iu5NterJfKgLl0fSRyXDJRjbYxVLgxTQLFBhxuXLiiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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