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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fe8e47174c39c68fd1d601b9589c56839caa90ce0d606dc0dc40f5edec03ecd' 
  AND token = '64c8PsYiQdyj3HPTfNooTQln9XaK4+Vq/a9lSZtZFQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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