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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08a484d731f703c25bfc7812dbc8d6ab3f2872ff6e5bda7450df79c9ec728c27' 
  AND token = 'hYZyHwRUZLCtlfsFLE95LCYDCsdUcSTijmrK7RELGOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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