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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3a57a89b43b84bae452be07565ce1572cda9d87f6698dbc5377e2b2481014c1' 
  AND token = 'Y5mzUGyb9qHwgnh7bSAiSS1hXN8jQjs0FXahQIEj4ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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