SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '774b4576e3dff0dadb66122b96efd942c0cc7877fbadf8544023cec328d2904c' 
  AND token = '9pwAR1qt1MhyfZOvVQp1X40Ssf5x/pgvb3Vuyl9zXCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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