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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9fd7b9c22de4f91b820f83b1e7b5506ac8765da4c778f64aa55d5c4d7f39ca8' 
  AND token = 'N5YM3QaXcTpnSYdQScmYVWcRnpOkkPTd7fs9oIP/XU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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