SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c1caa58055ea242178245f0955d16faed466fdfe0a93e9323d5042ab1eb9e77' 
  AND token = '+avy7pbzFBUkXcHJdcGQE43f2W2Qxw1SI6cVhgvZKDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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