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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86111109d88a46a6f5548231d651a4efb26c5435fb62d180d81371a247b74fb9' 
  AND token = 'SVgMc8HckI0EJTmM2hUsg01Ky8xuw+2gdFyHt+e8mzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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