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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0aa1c84ee9d9ca92004586be3738903ed6668bc73ceffa6cf387fb424e61e5fb' 
  AND token = '5b5Ufc7BdQu7X1YalOjlzctawbZD7n9V0Ss52GT9TEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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