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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7b51aaa0246142e2098c360d9edc4579ab507dc49c98568412dc34c363c9b15' 
  AND token = 'keSg7i3o6ItcP3YfpPNe7XsKTVn/CNI5WPoU/iivcVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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