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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f80064a4c64664611c7090a2306a611209924fb1240c39b793269469cbf4f3b' 
  AND token = 'ENkkiwUM5gCI1SPgt4krkubrfmiuEEEiUNMk87dNmBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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