SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '005f829ff3bb8fa75f83deac2bad7bf8c1d2e6f1444fda16f5ded0252687a342' 
  AND token = 'W0fJRJzx0G14V9xS8fk+gIm5fjIM+LYFb/3SICqhbYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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