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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5a21341b45d0bf1f5f1448ba896047ec87711522c01d3861d2331ee9f97267b' 
  AND token = 'r5gIJf04mtV0PcurbVCdRtEuj45rWPcFrF3/i05COss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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