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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '323e19743ce209b20e1f7f19d82c652351f2a859068349111d24fffed5426dd9' 
  AND token = 'rSiWn3PaK8eV+IZUserT/rpRS5NeYh+TZ24htKd79dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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