SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f382131dd56375ffba6ecf8fc4d33c09d82dd752da78d15eb4e5e3a278eb52d1' 
  AND token = 'KJHvfzuPLDqyJXItI7LwTW2U1f+hb37Y/qKG98ONdkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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