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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96475b23f602a17b0200fabbe5d384ebc128a05e5339f1f5469ee3342a3eb15c' 
  AND token = 'pfFIIgN8Ccw7a0aBDaeQu6xjckZVxbgZrJRHgsJgWXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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