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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a5d6e2a8c5a08df07b65dad3594e7384924d546192e3362cf34ffaefffbe9a5' 
  AND token = 'd9IWa5a+LQ//GGwau7EMBTJkUz7HiQjlwDreVARX0D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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