SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6893024e98f3b36179e7f172c1793245133d19f3d0310aea2d2ccbac634f5179' 
  AND token = 'hLB6HuvNLvCqy2kJoqxKGEsDJthD+Cf4TyBGU/xelxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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