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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8982a115ef4607900bbeabb7a2e8e1a92417f812b617416f3cf1f46eb4abef29' 
  AND token = 'tY+cQy2AtYZPYAgieH/TygOyRznjkZ+46Hz44892338=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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