SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd156f1fe5f8d4d8b27a1ff84726f9713fb5da77ed462d12554e35a7355f381aa' 
  AND token = 'wRzPwh6nzJjAVjHAexuFid7q79ZGYCZNmjPruIuIPIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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