SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dd3dfa2963147e7efb4954b93c201b739a29312ad225eebb8c20b271a8e6ad4' 
  AND token = '2GSzstwQZxhDwBlN2w6q/cFTgALfMXcE8l3q0IzLGB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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