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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9790cc53a1196c046d50a1d074181c7e8826d694347d0141cfcc43e3e6e9e5ee' 
  AND token = '+apmb2ymc+tInE1XQ1QOMgQXrPw3vJOvE/bJVfq95mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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