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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fc8345551349cab94926793e17a4c3521ca926e9c0105478a372cb06fb8e28f' 
  AND token = 'aUwS6w8aX9cdzSUimdv/mXyleDXFLb+po1+AROOrAgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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