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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2001c3ba6cc8f28518b9161bc70755c469ef4e3233bfc4be0173c13b71888ce3' 
  AND token = 'BlAoHI+8TMcfrweeBZDWeJGSe3UoCUgujkLf/Pbew2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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