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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12016e23031fe409fb71e21b21113b23f1b5d36cb2b92cad802337c1f5817d2d' 
  AND token = 'XwkAnxWqTKrpM0ilNME5LXKinD/frX2QL0yJjQuYqDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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