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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0fc6aa7d9217511bf60ee79258532330c64c70ba63f42a5c4740212f5e09439' 
  AND token = '5oppjlm7HTN8fS8gU7yfroNwEmh2/Qv9Li47bKq+wTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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