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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7bb86fc3342569d0faa5db101ec4ecb60672a3d6c2268c5dce49240651f7efd' 
  AND token = 'eEJInZOa525cnp0eA0l77/2fU7xc/1J3YJf03iMsytU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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