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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4454b4d55aae128bc6ec1f9e105041bebf0cebf699cbaf886a537c0b40bd2454' 
  AND token = '3QfLTKy/J7fuChTP+pkrWNugUj4Co8COj7GmdUXlpDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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