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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0806483228deee3d7c5745bd02a2daa49e80c9e12744629650624682494fa36' 
  AND token = 'WCmt1tmICJ9T4nLsH6CU9Obr3kFapeoFV9tCipUwyBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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