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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0803604b3d71247430d55f3a9d23de1809806c81dd39a1ba2b2275994a590fe' 
  AND token = '4HNxzdbrJl8qqCB7e/gYGB8jweBtcbePyqn4BrOHbpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00234

JSON explain

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