SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ebb08f658b7ad046f95f5b1c11cfe871720d38d668dfce9738409612a4fff72' 
  AND token = 'DqHVPPfKxMC5dYTFINob2ngaASB1TWnUunQ9JgFKn5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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